I use a browser t/o performance calculator to calculate my t/o speeds and flex temperature, it used to work just fine but for some time now the mcdu shows a “takeoff speeds too low” message, you can still just clear it and fly just fine but i thought it was weird. when i try to calculate the speeds via the mcdu it inputs much higher speeds then the ones that i get from the performance calculator (usually about 170-179kt for vr ). I find it weird that it just started happening on its own because i don’t recall downloading any new liveries. What do you think causes this?
PS.:im on the stable version.
If you use development version you can use the efb to calculate flex temp.
I think it is generally recommended to use this version where possible.
I use the onboard EFB to calculate the take-off performance and so far it has worked reasonably. Before that I used to use other online calculators and software to calculate speeds and I did notice that speeds calculated there were not accurate maybe perhaps they don’t use accurate performance figures to begin with.
Use the developer’s version instead - You get onboard calculator on EFB as well new FMGS software.
For trim use the graph at the bottom of their checklist to set the correct trim based on your C.G.